Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Module 15 > 15.10 Lubrication Systems > Flashcards

15.10 Lubrication Systems Flashcards

1
Q

Are wet or dry sump lubrication systems used gas turbine engines?

A

Both

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How do wet sump lubrication store there oil?

A

In the engine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How do dry sump lubrication store there oil?

A

External supply tank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How can the engine oil lubrication systems be classified?

A

All flow system, constant pressure system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Give two characteristics of the full flow system?

A

The simplest oil supply system, has no way of regulating oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does the pressure change in a full flow system?

A

Changes in the rotor speed (N2), oil temperature, flow areas downstream of the supply pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is an oil cooler installed in the supply line called

A

Hot tank system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How is the supply pump driven?

A

The N2 rotor system via the gearbox

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is an oil cooler installed in the scavenge line called?

A

Cold tank system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How does the N2 rotor and oil pressure correlate?

A

Faster the N2 rotor spins the higher the oil pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What will a leakage cause?

A

A decreased in oil pressure and quantity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the two main types of oil coolers used for turbine engine?

A

Fuel cooled oil coolers
Air cooled oil coolers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Why is a pressure relief valve installed between the delivery side and the suction side?

A

To prevent oil pressure from becoming too high

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What can I constant pressure system also be called?

A

Regulated pressure system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does the pressure regulating involve do in the constant pressure system?

A

Holds the oil pressure to a given design value at all N2 rotor speed from idle to maximum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Does change in temperature affect pressure in constant?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What can the pressure regulating valve also do?

A

Holds pressure difference between the oil pressure and the vent pressure constant, insures that we have the same flow at all engines speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What main components in fuel cooled oil cooler

A

Housing
Cover
Core

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the advantages of the full flow system?

A

The full-flow system is the most commonly used system because of its simplicity. Another advantage of this system is that no adjustments are necessary during maintenance of the engine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the disadvantages of full flow lubrication systems?

A

The system needs a large supply pump or a relatively high oil pressure when the engines are at idle. This leads to very high oil pressures at higher speeds
There is a significant rise in oil temperature after a power reduction. The oil removes much of the heat from the bearings. When the power is reduced, the lower flow rate of the oil causes the oil temperatures to increase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Why is the exhaust turbine a critical lubricating point?

A

Due to high temperatures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

How does a capacitance type transmitter work

A

Uses electronic plates and an electric connector, lower part immersed in oil and has two parts that form capacitor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Where can air cooling be provided from?

A

Early stages of the compressor

24
Q

The basic lubrication system has four subsystems what are they?

A

An oil reservoir and supply system
A scavenge system
A vent system
A monitoring system

25
Q

What is the purpose of the engine oil system?

A

To apply oil to lubricate, cool and clean the engine bearings and gearboxes

26
Q

What are the three subsections of the oil system?

A

Storage, distribution and indicating

27
Q

How is the oil tank usually made?

A

Fabricated from an aluminium alloy coated with a layer of silicone to give sufficient fire resistance

28
Q

What are two normal ways to fill a tank?

A

Gravity - Where oil is added to the tank directly through the oil tank filler
pressure - Where a pressurised oil source is connected to a filling manifold. This connection is typically made using specialised adapters or fittings

29
Q

What is the filler surrounded by?

A

The scupper

30
Q

What is a reed type transmitter

A

Metal tube with a float and multi switch assembly. Metal tune has magnets which show how full tank is based on the floats height

31
Q

What does a scupper do?

A

Catches any oil spilled during servicing and drains it to the engine drain mast

32
Q

Why is there a check valve installed on the filler cap?

A

Prevents discharge of air and oil through the filler when cap is not correctly fitted

33
Q

What is the oil pump designed for?

A

Supply oil under pressure to the parts of the engine that require lubrication

34
Q

What are the two most common pumps?

A

The gear pump (most commonly used), the gertor pump

35
Q

What does SOAP stand for

A

Spectrometric Oil Analysis Program

36
Q

The gear type oil pump has only two element what are they?

A

One for oil pressure and for scavenging

37
Q

What element does the gretor pump have?

A

Usually contains a single element for oil pressure and several elements for scavenging oil

38
Q

Where is the oil pressure regulating valve usually fitted?

A

On the pressurer side of the pump

39
Q

Why might a large turbofan engine not have a regulating valve ?

A

System pressure varies with engine rpm and pump speed .pressure regulator valve is used instead

40
Q

If an oil cooler is used ,why is it important to use a pressure regulator valve?

A

The oil cooler is walls are thin and can easily rupture

41
Q

How does SOAP work

A

Use spectrometric analysis to identify and quantising the metal particles

42
Q

What is the purpose of a bypass valve?

A

Used in conjunction with an oil cooler and is used to maintain proper temperature and pressure by varying flow into the oil cooler filter

43
Q

What is used to protect the oil pump from FOD ?

A

Screens

44
Q

Other than protecting the oil pump what else do screens protect?

A

Oil nozzles, if the filter is bypassed

45
Q

What is another name for a screen?

A

Last chance filter

46
Q

What do all filters consist of?

A

Filter housing, removable cover, filter bypass valve, electric or mechanical clogging indicators

47
Q

What size particles can SOAP detect

A

0.001mm-0.02mm

48
Q

What are the two types of chip detectors

A

Magnetic and manual

49
Q

What are the two types of chip detectors

A

Magnetic and manual

50
Q

How does a magnetic chip detector detect metal

A

Measures resistance between particles with magnets

51
Q

What are the two types of transmitters used?

A
  • capacitance type transmitter
  • reed switch type transmitter
52
Q

Why are metal particulates a big problem in oil systems?

A

Particulars can club pipework, and once one is broken into the oil, it can cause more to break off into the oil, and so on

53
Q

Why must additives in oil being measured over time

A

Additives kind of grade or deplete overtime. These additives are important for the oils performance.

54
Q

What provides information about the internal wear of lubricate the engine parts?

A

Debris monitoring system

55
Q

One method is an easier method of detecting FOD between soap and magnetic chip detectors

A

Magnetic chip detectors

Module 15 (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions